You can not convert square miles ( area measure) to miles ( linear measure).
They measure different things.
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A four mile square is a square, each of whose sides is 4 miles long. Its area will be 4 miles * 4 miles = 16 square miles.
570,374 square miles. 570,374 square miles equals 15,917,841,561,600 or almost 16 trillion square feet
1 square mile = 640 acres ⇒ 40 acres = 40 ÷ 640 sq miles = 1/16 sq mile = 0.0625 sq mile
250 square miles.
It round to: 59,420 square miles and not 59,419 square miles